2.实义动词还可分为持续动词与瞬间动词, 前者可以与表示段时间的时间状语连用, 而后者不可. 但瞬间动词的否定式表示该动作没有发生, 可视为一种可持续的状态, 并可与段时间状语连用
a. They watched the train leave for five minutes. ( watch是持续动词)
b. I received his letter yesterday. ( receive是瞬间动词)
c. How long have you joined the army ?(错误: joined是瞬间动词, 不能与段时间how long连用)
d. When did you join the army ? (正确)
e. How long have you been in the army ? (正确)
f. How long may I borrow the book ? (错误: borrow是瞬间动词, 不能与段时间how long连用)
g. How long may I keep the book ? (正确)
h. I havent received his letter for almost two months. (not receive表示没有收到, 这一意思可视为一种持续的状态, 因此可以和段时间two months连用)
四.短语动词的种类: 共有五种不同的短语动词
1. 动词+介词: 相当于一个及物动词, 如: depend on, look for
2. 动词+副词: 有的相当于及物动词, 如: look up(查找), 有的相当于不及物动词, 如: slow down(慢下来). 这类短语动词的宾语是代词时, 只能放在动词和副词之间, 如: call her up; 这类短语动词的宾语是名词时, 既可放在动词和副词之间, 也可放在副词之后, 如: call Tom up或call up Tom
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